1 /* SPDX-License-Identifier: GPL-2.0 */
3  * Lightweight buffered reading library.
37 	io->fd = fd;  in io__init()
38 	io->buf_len = buf_len;  in io__init()
39 	io->buf = buf;  in io__init()
40 	io->end = buf;  in io__init()
41 	io->data = buf;  in io__init()
42 	io->timeout_ms = 0;  in io__init()
43 	io->eof = false;  in io__init()
46 /* Read from fd filling the buffer. Called when io->data == io->end. */
51 	if (io->eof)  in io__fill_buffer()
52 		return -1;  in io__fill_buffer()
54 	if (io->timeout_ms != 0) {  in io__fill_buffer()
57 				.fd = io->fd,  in io__fill_buffer()
62 		n = poll(pfds, 1, io->timeout_ms);  in io__fill_buffer()
67 			n = -1;  in io__fill_buffer()
70 			io->eof = true;  in io__fill_buffer()
71 			return -1;  in io__fill_buffer()
74 	n = read(io->fd, io->buf, io->buf_len);  in io__fill_buffer()
77 		io->eof = true;  in io__fill_buffer()
78 		return -1;  in io__fill_buffer()
80 	io->data = &io->buf[0];  in io__fill_buffer()
81 	io->end = &io->buf[n];  in io__fill_buffer()
88 	if (io->data == io->end) {  in io__get_char()
94 	return *io->data++;  in io__get_char()
98  * first character isn't hexadecimal returns -2, io->eof returns -1, otherwise
99  * returns the character after the hexadecimal value which may be -1 for eof.
100  * If the read value is larger than a u64 the high-order bits will be dropped.
113 			*hex = (*hex << 4) | (ch - '0');  in io__get_hex()
115 			*hex = (*hex << 4) | (ch - 'a' + 10);  in io__get_hex()
117 			*hex = (*hex << 4) | (ch - 'A' + 10);  in io__get_hex()
119 			return -2;  in io__get_hex()
126 /* Read a positive decimal value with out argument dec. If the first character
127  * isn't a decimal returns -2, io->eof returns -1, otherwise returns the
128  * character after the decimal value which may be -1 for eof. If the read value
129  * is larger than a u64 the high-order bits will be dropped.
142 			*dec = (*dec * 10) + ch - '0';  in io__get_dec()
144 			return -2;  in io__get_dec()
192 	return -ENOMEM;  in io__getdelim()